Horn for talking machines



Aug. 26 1924. 1,505,972

B. R. SEABROOK HORN FOR TALKING HACHINE$ Original Filed June 1?, 1918 2 Sheets-Sheet. l

Imam-on B scab-00k Arr Aug. 26, i924. $1,505,972

B. R. SEABROOK HORN FOR TALKING MACHINES Original Filed June 17. 1918 2 Sheets-Sheet 2 TOR Patented Aug. 2, 1924.

UNITED, STATES v 1,505,972 PATENT OFFICE.

BAGSTER ROADS SEABROOK, OF HISHAWAKA, INDIANA.

HORN FOR TALKING ILAOHINES.

Application filed .Tune 17, 1918, Serial No. 240,475. Renewed. .Tune- 20, 1924.

To all whom it may concern:

Be it known that I, BAGSTER ROADS SEA- BROOK, a subject of Great Britain, formerly resident of Canada and now a resident of Mishawaka, inthe county of St. Joseph and State of Indiana, have invented certain new and useful Improvements in Horns for Talking Machines, of which the following is the specification.

The invention relates to improvements in horns for talking machines, particularly amplifying horns and the general object of the invention is to provide an improved type of horn which will receive sound waves and deliver them in a full, clear, pure and natural manner and without extraneous modifications. i

A further object of the invention is to construct a horn with a specially treated porous body.

A still further object of the invention is to construct a horn having a specially thickened neck arranged to eiiectively deliver unmodified sound waves to the body of the horn and further to constructthe body of the horn so that it presents an elliptical cross section at all points which gradually increases in cross sectional area in passing from the neck to the delivery end of the horn.

With the above more important objects in view the invention consists substantially in a horn arranged and constructed as hereinaihter more particularly described and later pointed out in the appended claims,

reference being had to the accompanying drawings in which Fig. It represents a side view of the horn, Fig. 2 represents a plan view of the same. Fig. 3 represents an end view. Fig. 4: represents a vertical sectional view through the horn, the section being taken ill in the plane denoted by the line Xe-X.

Fi 5 represents a sectional view trans= versely through the horn, the section being taken in the plane denoted by the line ZZ'.

Fig. 6 represents an enlarged detailed sectional view through a portion of the neck of the horn. I

Fig. 7 represents a cross sectional view through the horn at YY'.

l i 7 represents an enlarged detailed sectiona view through a portion otthe body of the horn.

Fig. 8 represents a vertical sectional view centrally through the neck.

In the drawings like characters of reference indicate corresponding parts in the several figures.

The horn indicated generally by the reference numeral 1 comprises what might be termed a flaring body part 2 and a neck 3 continuous with the body part and positioned more or less at right angles thereto; i represents the entry end of the horn and 5 the delivery end. The neck embodies an elbow like part 6 which elbow, for the purpose of the present description, is considered as that part of the neck appearing between the lines ZZ and XX and actually is the connecting part between the vertically disposed portion ofthe neck and the horizontally disposed inner end of the horn body. The vertically disposed part of the neck, that is to say that part extending "from the entrance end lto the line Z-Z, 1s circular in cross sect on and at the point where the elbow connects with the horn body the cross section is elliptical.

Between the oneend of the elbow and the other, that is to say between the circular end and the elliptical end thereof, the elbow gradually merges from a circular shape into an elliptical shape and gradually increases cross sectional area. On the underside, as indicated at 7, the elbow is slightly bellied or bulged.

The horn may be constructed in a particular manner being prepared from a shell of paper-like material such as papien mache specially treated as shortly disclosed In making the horn l first shape the aper-like shell of the form herein before disclosed and of uniform thickness and then treat the shell in the following way l t is first l1 pregnated with a self-setting liquid solution which permeates the shell, fill ing the pores and which upon setting stififens the shell. This part of the construction has been indicated by dots applied in the enlarged sectional views shown in the drawings Figs. 6 and 7.

After the self-setting solution has set the whole horn may be given a coating of shellac, inside andout as indicated at 8 and as soon as this has hardened l increase the thickness of the horn at the neck by applying a comparatively heavy coating of specially adapted non-shrinkable and very ad a} hesive cement-like composition as indicated at 9. After the cement has hardened the horn may then be covered with a linen-like fabric 10 that has been moistened by a suitable adhesive. This fabric is tightly drawn onto the horn with its edges overlapped. As the fabric dries it shrinks thus pulling it more tightly on the horn. If desired the horn may be given a further overall coating of shellac as instanced at 11 and after this is dry a final inside and outside coating of varnish may be applied as indicated at 12. As soon as the varnish has become hard the horn is ready for use. 7

A very important feature in the use of a porous paper-like body or support in con-- nection with a very heavy coating of a nonshrinkable cement-like composition applied at the neck of the horn is to insure its nonresponsive and non-absorptiveness at the point where the sound waves are deflected toward the open end of the horn, thus by reason of the increased thickness at the neck being tho-roughly incorporated with the paper-like support, results are secured which are superior to those secured withhorns that do not have a non-shrinkable cement-like composition incorporated therewith at and near the point where the principal waves are reflected. The composition away from this point is thinner toward the large end of the horn as shown in Fig. 8.

In horns which have a neck or elbow there is a tendency to remain mechanically weak where the bend occurs and in addition to become veryabsorptive of passing sound waves, acondition not found in horns which are formed without necks thus by reinforcing the neck with my cement-like composition the absorption of sound waves is prevented and the horn is made more rigid. While the description more especially relates to horns for talking machines I do not limit myself to its use in connection with specific sources of sound productions as these may be mechanical, acoustical, electrical etc.

What I claim as my invention is:-

1. An amplifying horn body formed of a porous paper-like material of approximately uniform thickness having an elbow at its small end, and a coating of cementlike composition placed on the body thicker at the elbow than at the large end of the horn.

2. A tapering amplifying horn having the body part terminating in a neck at the small end thereof, the whole being formed from paper-like material impregnated with a selfsetting solution, and an extra thickness of a non-shrinkable composition placed on the neck portion of the horn.

3. An amplifying horn having the body part thereof constructed from a cellular paper-like material impregnated with a self setting solution, a cementitious composition in intimate contact with the body, an elbowed neck to said body said elbow being formed with an extra mass of the composition, and the neck elbow and body being homogeneous continuations of each other. I

4. An amplifying horn, a tubular body of paper-like material terminating in a reduced diamter at one end, a curved neck at this end, a coating of a self-hardening composition applied to said body, and an extra thick coating of the composition applied to the curved portion of said neck.

5. In amplifying horns, a conical body of paper-like material, a curved neck at the small end, a coating of itself-hardening composition applied to said body thicker on the curved portion of the neck that at the large end of the horn, and a layer of fabric around the composition.

Signed at Winnepeg, this 29th day of May 1918.

BAGSTER ROADS 'S EABROOK.

In the presence of- G. S. ROXBURGH, K. B. VAKEFIELD. 

